Start object expected – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch expects a JSON object but doesn’t find one. This usually happens due to incorrect or malformed JSON input. To resolve this issue, you can validate your JSON input using a JSON validator to ensure it’s correctly formatted. Also, ensure that your JSON starts with a ‘{‘ and ends with a ‘}’. If you’re using a file as input, check that it’s being read correctly and the entire content is valid JSON.

This guide will help you check for common problems that cause the log ” start object expected ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “start object expected” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ElasticsearchParseException("unknown field name  [" + currentFieldName + "]");
 } else {
 throw new ElasticsearchParseException("start object expected");
 return incompatibleSnapshotIds;
 }  private static SnapshotId snapshotIdFromXContent(XContentParser parser) throws IOException {


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